    DNSBLOG(8)                                                          DNSBLOG(8)

    NAME
           dnsblog - Postfix DNS blocklist logger

    SYNOPSIS
           dnsblog [generic Postfix daemon options]

    DESCRIPTION
           The  dnsblog(8)  server implements an ad-hoc DNS blocklist
           lookup service that will eventually be replaced by an  UDP
           client  that  is  built  directly  into  the postscreen(8)
           server.

           With each connection, the dnsblog(8) server receives a DNS
           blocklist domain name and an IP address. If the address is
           listed under the DNS blocklist, the dnsblog(8) server logs
           the match and replies with the query arguments plus a non-
           zero status.  Otherwise it replies with  the  query  argu-
           ments  plus a zero status.  Finally, The dnsblog(8) server
           closes the connection.

    DIAGNOSTICS
           Problems and transactions are logged to syslogd(8).

    CONFIGURATION PARAMETERS
           Changes to main.cf are picked up  automatically,  as  dns-
           blog(8)  processes  run for only a limited amount of time.
           Use the command "postfix reload" to speed up a change.

           The text below provides  only  a  parameter  summary.  See
           postconf(5) for more details including examples.

           config_directory (see 'postconf -d' output)
                  The  default  location  of  the Postfix main.cf and
                  master.cf configuration files.

           daemon_timeout (18000s)
                  How much time a Postfix daemon process may take  to
                  handle  a  request  before  it  is  terminated by a
                  built-in watchdog timer.

           postscreen_dnsbl_sites (empty)
                  Optional list of DNS blocklist domains, filters and
                  weight factors.

           ipc_timeout (3600s)
                  The time limit for sending or receiving information
                  over an internal communication channel.

           process_id (read-only)
                  The process ID  of  a  Postfix  command  or  daemon
                  process.

           process_name (read-only)
                  The  process  name  of  a Postfix command or daemon
                  process.

           queue_directory (see 'postconf -d' output)
                  The location of the Postfix top-level queue  direc-
                  tory.

           syslog_facility (mail)
                  The syslog facility of Postfix logging.

           syslog_name (see 'postconf -d' output)
                  The  mail  system  name  that  is  prepended to the
                  process name in syslog  records,  so  that  "smtpd"
                  becomes, for example, "postfix/smtpd".

    SEE ALSO
           smtpd(8), Postfix SMTP server
           postconf(5), configuration parameters
           syslogd(5), system logging

    LICENSE
           The  Secure  Mailer  license must be distributed with this
           software.

    HISTORY
           This service is temporary with Postfix version 2.7.

    AUTHOR(S)
           Wietse Venema
           IBM T.J. Watson Research
           P.O. Box 704
           Yorktown Heights, NY 10598, USA

                                                                        DNSBLOG(8)